diff --git a/kernel/x86_64/KERNEL b/kernel/x86_64/KERNEL
index 26805041b..4e7d9aeff 100644
--- a/kernel/x86_64/KERNEL
+++ b/kernel/x86_64/KERNEL
@@ -487,9 +487,10 @@ XTRSMKERNEL_RT	=  xtrsm_kernel_LT_1x1.S
 
 XGEMM3MKERNEL    =  xgemm3m_kernel_2x2.S
 
-ifeq ($(OSNAME),WINNT)
+
 SSUMKERNEL = ../arm/sum.c
 DSUMKERNEL = ../arm/sum.c
+ifeq ($(OSNAME),WINNT)
 CSUMKERNEL = ../arm/zsum.c
 ZSUMKERNEL = ../arm/zsum.c
 endif